MEASURING NEGATIVE SEQUENCE CURRENT CONVERTER Russian patent published in 2011 - IPC G01R29/16 

FIELD: electricity.

SUBSTANCE: measuring current converter contains negative sequence voltage filter representing resistor-capacitor circuit connected to the first, the second and the third input clamps, as well as to the first and the second output clamps of that filter, to which the load of the above measuring converter is also connected. The first capacitor is connected between the first input and the first output clamps of that filter; the first resistor is connected between the first output and second input clamps of filter; the second capacitor is connected between the second input and the second output clamps of filter, and the second resistor is connected between the second output and the third input clamps of filter, at that, at nominal value of frequency of three-phase circuit to which the above measuring converter is connected.

EFFECT: high selectivity and considerably smaller total weight of device.

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